Forum Discussion

coffebreak's avatar
coffebreak
Explorer
Oct 23, 2014

tire codes, how to read??

bought a used 2008 trailer today and the tires on it are ST/175/80D/13
they look in great shape no checking or wear.
there is a DOT number on the sidewall which reads
DOT 4LJU and than in a circle are the numbers 3606.

can anyone tell me if these are new tires or need replacing?
if they need replacing they are load range C with a capacity of 1310 lbs per tire.
i found a ST/17580R/13 with a load range of D with a capacity of 1610lbs per tire.
if i need 4 tires is it better off to go with the D range for almost the same price and its a radial.
the trailer is 21ft and dry weight is 3400lbs in which we will have about a 1000 lbs in gear.
thanks for the help

12 Replies

  • Increasing the load capacity isn't a problem, you just generally never want to go down in capacity.
  • Believe tires were manufactured in the 36th week of 2006. So that would be, what, during about September 2006.

    First two numbers mean the week, last two are the year of manufacturer.

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,283 PostsLatest Activity: Jul 17, 2025